GEARLINE TOOLS / FREE TO USE

Less guessing.
Better decisions.

Four practical calculators. Clear units, visible assumptions, and numbers you can use.

Tire size comparison

Compare tire diameter, sidewall, circumference, and estimated speedometer changes.

Plan parts, labor, shipping, tax, and a reserve. Save on this device or download a copy.

Compare two setups in hp/lb, lb/hp, hp/kg, and hp per metric tonne or US ton.

Estimate weekly, monthly, and annual fuel spending, with a second scenario for comparison.